Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45c7fc9e5d244b4…

MALICIOUS

PDF

84.0 KB Created: 2021-03-19 17:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de5f1c6b06cdf25f105e9df0721b8a58 SHA-1: daf30da29ef3bef71de0f9340167e179db94389a SHA-256: a45c7fc9e5d244b41bd4a87fb01162ded6fc84fb9a7c284206f45f2bdd0111c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to trick users into downloading further malicious content. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=core+connections+algebra+1+answers+pdf+chapter+2
    • http://lugabev.mygamesonline.org/asus_ac1900_aimesh_setup.pdf
    • http://zifeladawu.scienceontheweb.net/16626522047.pdf
    • https://cdn-cms.f-static.net/uploads/4404725/normal_60237fa2de698.pdf
    • https://cdn-cms.f-static.net/uploads/4494435/normal_603eff8c63b96.pdf
    • http://zisapawiwako.mypressonline.com/notoxulupujokedi.pdf
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5ff6886721aa3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wupixufekijax/healthy_relationship_worksheets.pdf
    • https://s3.amazonaws.com/zusevamasor/52440366257.pdf
    • https://s3.amazonaws.com/wizuluworafid/basler_ace_gige_camera_manual.pdf
    • http://gozotonitiki.epizy.com/51620351559.pdf
    • https://s3.amazonaws.com/norozovijalu/gibokojup.pdf
    • https://s3.amazonaws.com/moduxanakuri/nunutovopuvowokurege.pdf
    • https://s3.amazonaws.com/tezofuretejom/46182336361.pdf
    • https://s3.amazonaws.com/legobegutulo/zofavezelotekow.pdf
    • https://s3.amazonaws.com/jejulurowev/best_rb_ballads_of_the_2000s.pdf
    • https://s3.amazonaws.com/tosevud/muckleshoot_tribal_college.pdf
    • http://vomewudige.atwebpages.com/suffixes_test.pdf
    • https://s3.amazonaws.com/dobikasukavu/3594673202.pdf
    • https://s3.amazonaws.com/xupizewuxere/agent_bhairava_telugu_songs.pdf
    • http://selosaxugi.epizy.com/anganwadi_delhi_online_form_2018.pdf
    • https://s3.amazonaws.com/wobuzisibal/jawikulisovomug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61e.bin
670a087f02be8b3738558c70a158528f81410aa4181d061c58a1187fd4ecafc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 5644 bytes
font_01_sfnt_off0000f959.bin
58590d76e7dd8c76cb5117de605fe0984ed4820d2742f6831769ced59d674ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 11056 bytes
font_02_sfnt_off00011f3a.bin
18344b64a226d109813ff392280c61da383d29fb6398ef2fae97cc1a212bcca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16076 bytes
font_03_sfnt_off000133e9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 4324 bytes

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